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A compact disc is designed to last an average of 4 years with a standard deviation of 0.8 years. What is the probability that a CD will last less than 3 years?

A compact disc is designed to last an average of 4 years with a standard deviation of 0.8 years. What is the probability that a CD will last less than 3 years?
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A compact disc is designed to last an average of 4 years with a standard deviation of 0.8 years.

What is the probability that a CD will last less than 3 years?

asked
User Bela Ban
by
7.4k points

1 Answer

1 vote
3-4/.8=1.25
then use the probability z chart,

10.56%

!!!
answered
User Sunnytown
by
8.4k points
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